How closure captures value type?

Please look at the following simple example:

var cl: (() -> ())! 
func foo() { 
    var x = 20
    cl = { 

cl() // prints 20

Since x is an Int which is a value type and value types are "living" on the stack, once foo returns x should be vanished. Following the above mentioned line of reasoning x shouldn't exist when cl is called, but it still prints 20. Can somebody explain how closure captures x in this case and keeps it in memory.
Please note that I'm not capturing x with capture list in this case. In case of capture list it is obvious since capturing value type with capture list just makes a copy of a captured value.

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